MIL -۱۰۰(V) as a Visible-Light-Responsive MOF: Structural, Optical, and Electrochemical Insights into Photocatalytic Hydrogen Evolution

The advancement of visible-light-active photocatalytic materials with enhanced efficiency is vital for advancing sustainable hydrogen production. This work presents the solvothermal synthesis, detailed characterization, and photocatalytic evaluation of MIL-۱۰۰(V), a vanadium-based MOF, as a promising candidate for hydrogen evolution under visible light. The material was characterized by XRD, FESEM, EDS, FTIR, DRS, EIS, LSV, and Mott-Schottky analysis. MIL-۱۰۰(V) demonstrated high crystallinity, uniform microcrystalline morphology, and strong visible-light absorption with a band gap of approximately ۲.۴۳ eV. Electrochemical studies confirmed its n-type semiconducting behavior with a CB position of –۰.۹۴ V vs. NHE, suitable for proton reduction. Photocatalytic hydrogen evolution experiments revealed a hydrogen production rate of ۲۱.۰ μmol g⁻¹ h⁻¹ in pure water, which significantly increased to ۱۷۷.۰ and ۲۶۱.۰ μmol g⁻¹ h⁻¹ in the presence of methanol and TEOA, respectively, demonstrating the crucial role of sacrificial agents. These results confirm that MIL-۱۰۰(V) is a promising MOF-based photocatalyst for photocatalytic hydrogen generation under solar irradiation and highlight the synergistic benefits of vanadium incorporation and ligand design.

کلیدواژه ها:

MIL-۱۰۰(V) ، Photocatalytic Hydrogen Evolution ، Metal–Organic Frameworks (MOFs) ، Visible-Light Photocatalysis ، Electrochemical Characterization.